Hydroxylation of Benzene with Hydrogen Peroxide over Highly Efficient Molybdovanadophosphoric Heteropoly Acid Catalysts

Keggin 类型 molybdovanadophosphoric heteropoly 酸， H3+nPMo12-nVnO40 (n = 1 3 ) ，被一个新奇环境联盟者准备良性的方法，和他们的催化表演在冰川的醋酸和 acetonitrile 的混合溶剂作为氧化剂与氢过氧化物经由苯的 hydroxylation 被评估到酚。各种各样的反应参数例如反应时间，反应温度，到氢过氧化物的苯的比率，水的氢过氧化物的集中，到在溶剂和催化剂集中的 acetonitrile 的冰川的醋酸的比率，被改变获得最佳的反应条件。H3+nPMo12-nVnO40 (n = 1 3 ) 被揭示是为苯的 hydroxylation 的高度有效的催化剂。在 H5PMo12-nVnO40 的情况下，有 100% 的酚的选择的 34.5% 的苯的变换能以最佳的反应条件被获得。

Keggin type molybdovanadophosphoric heteropoly acids, H3＋nPMo12-nVnO40（n=1-3）, were prepared by a novel environmentally benign method, and their catalytic performances were evaluated via hydroxylation of benzene to phenol with hydrogen peroxide as oxidant in a mixed solvent of glacial acetic acid and acetonitrile. Various reaction parameters, such as reaction time, reaction temperature, ratio of benzene to hydrogen peroxide, concentration of aqueous hydrogen peroxide, ratio of glacial acetic acid to acetonitrile in solvent and catalyst con- centration, were changed to obtain an optimal reaction conditions. H3＋nPMo12-nVnO40（n=1-3） are revealed to be highly efficient catalyst for hydroxylation of benzene. In case of H5PMo10V2O40, a conversion of benzene of 34.5% with the selectivity of phenol of 100% can be obtained at the optimal reaction conditions.